Types of Waves

Q.

A bird makes a high-pitched sound whereas a lion makes a low-pitched roar. So, the frequency of sound made by lion is ______ that of bird.

1. less than

2. more than

3. None of the above

4. equal to

Q. Loudness of a sound is measured in_________.

1. metre
2. metre per second
3. hertz
4. decibel

Q. Particles oscillate perpendicular to the direction of wave motion in wave.

1. transverse
2. longitudinal
3. circular

Q.

Is light transverse wave?

Q. The pleasant sounds are called _________ .

1. music
2. noise
3. loudness
4. pitch

Q.

Frequency of 1Hz corresponds to ______

Q. In a longitudinal wave, a compression is a region of ____________.

1. low density
2. high density
3. low pressure
4. no pressure

Q.

How is a wavefront different from a ray?

Q.

In a _________ wave, the particles of the medium oscillate in a direction perpendicular to the direction in which the wave.

Q. The frequency of a vibrating body is $25Hz$. Calculate its time period (in $sec$).

1. 0.04

Q.

Classify the wave on the basis of direction of motion of particles.

Q.

A drum vibrates with a lower frequency as compared to a whistle. Then, we can say that:

1. The sound produced by the drum is louder than the whistle.

2. The sound produced by the whistle is louder than the drum.

3. The sound produced by the drum has a higher pitch than the whistle.

4. The sound produced by the whistle has a higher pitch than the drum.

Q. Loudness of sound is proportional to ____________ .

1. its amplitude
2. square of its frequency
3. its frequency
4. square of its amplitude

Q. Explain the differences between the sounds of a cello and a violin in terms of frequency, pitch and time period.
[5 MARKS]

Q. Loudness is proportional to the square of the amplitude of a sound wave.

1. False
2. True

Q. Infrasounds have frequency ___.

1. below 20 Hz
2. between 20 - 2000 Hz
3. between 2000 - 20 kHz
4. above 20 kHz

Q. If the amplitude of a sound is tripled, What will be the effect on its loudness?

1. Increases four times
2. Decreases four times
3. Increases six times
4. Decreases six times

Q. The frequency of a vibrating body is 5 Hz. Calculate its time period?

1. $0.1s$
2. $0.2s$
3. $0.8s$
4. $0.4s$

Q.

What are transversal waves? What is the difference between EM waves and transversal waves?

Q. What is wane front? State its relation with ray of light.

Q. In which of the following media can sound travel as a transverse wave?

1. Water
2. Nitrogen
3. Vacuum
4. Wood

Q. Which of the following is true regarding a transverse wave?

1. Particles move about their fixed positions.
2. The direction of movement of particles is perpendicular to the direction of movement of the wave.
3. The direction of movement of particles is parallel to the direction of movement of the wave.
4. None of these

Q.

The pitch of the sound describes how loud is the sound? Write the correct statement?

Q. If the loudness of sound exceeds, it can cause harm to the human ear.

1. $50\text{dB}$
2. $75\text{dB}$
3. $80\text{dB}$

Q.

A string connected to the end of the tuning fork kept in a horizontal position, will execute _______.

1. a parallel wave motion

2. a transverse wave motion

3. a damped oscillation

4. a circular wave motion

Q. Which of the following are sources of noise pollution?

1. Crackers
2. Silencers
3. Heavy machines
4. Loud speakers